“We write to express our serious concerns regarding what these episodes imply about FAA oversight of airlines and aircraft repair stations,” the lawmakers said in the letter, which copied Daniel Elwell, the acting administrator of the Federal Aviation Administration (FAA).

DeFazio and Larsen requested a briefing with senior FAA officials to discuss various oversight matters, in addition to an oversight report from the FAA on Allegiant. They also asked for a response from the Transportation Department on the fatal Southwest incident.

“We request that you provide complete responses to the above questions and schedule the above briefing as soon as possible,” DeFazio and Larsen wrote.

The letter comes amid a renewed focus on aviation safety after a female passenger aboard a Southwest flight was killed Tuesday when a piece of the engine broke off mid-air, shattered a window and partially sucked the woman out of the plane.